XYYXF Project News

News and project updates which haven't been added to distributedcomputing.info yet.

Moderators: Jwb52z, CedricVonck, kpearson, Honza, Lupine1647

Postby Jwb52z » Sun Jun 08, 2008 7:29 pm

Friday, June 6th, 2008. A new page, Primes and PRPs of the form xy + yx, http://xyyxf.at.tut.by/primes.html#0 , appeared on our site. These tables were originally maintained by Paul Leyland, http://www.leyland.vispa.com/numth/primes/xyyx.htm , but became outdated with time, so there's a new version, somehow revised and supplemented with the latest results.

Thursday, May 29th, 2008. Our newcomer, Serge Batalov, raised the ECM record, http://xyyxf.at.tut.by/records.html#ecm , up to 56 digits, http://xyyxf.at.tut.by/records/p56_114_103.txt , completing the factorization of 114^103 + 103^114. Congratulations Serge!
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Postby Jwb52z » Thu Oct 02, 2008 9:02 pm

Thursday, September 25th, 2008. MSieve 1.38, http://www.boo.net/~jasonp/qs.html , was released, http://www.mersenneforum.org/showpost.php?p=143714 . Square root became twice faster, a lot of other enhancements.
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Postby Jwb52z » Wed Dec 24, 2008 7:04 pm

Tuesday, December 2nd, 2008. MSieve 1.39, http://www.boo.net/~jasonp/qs.html , was released, http://www.mersenneforum.org/showpost.php?p=151582 . A lot of changes, tweaks and fixes http://www.mersenneforum.org/showthread.php?t=10144 .
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Postby Jwb52z » Tue Jan 20, 2009 3:52 am

Monday, January 5th, 2008. Serge Batalov factored 124^65 + 65^124, http://xyyxf.at.tut.by/records/c225_124_65.txt , just in 10 days, setting up two XYYXF records, for the largest prime factor, http://xyyxf.at.tut.by/records.html#prime , (96 digits) and for the largest factorization (225 digits), http://xyyxf.at.tut.by/records.html#snfs . By the way, no factors of this number were previously known. Congratulations again Serge!
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Postby Jwb52z » Sun Feb 01, 2009 9:23 pm

Tuesday, January 27th, 2009. The total number of the composites was reduced to 2100. The 2k milestone is definitely reachable within 2009.
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Postby Jwb52z » Mon Feb 16, 2009 3:21 am

Wednesday, February 11th, 2009. Greg Childers made a nice SNFS-split of 14325 + 25143, yielding a record-size prime factor, http://xyyxf.at.tut.by/records.html#prime , of 98 digits, http://xyyxf.at.tut.by/records/p98_143_25.txt . Quite close to the googol barrier!
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Postby Jwb52z » Sat Feb 21, 2009 3:14 am

Monday, February 16th, 2009. Jeff Gilchrist published a nice Beginners Guide to NFS factoring using GGNFS and Msieve, http://gilchrist.ca/jeff/factoring/nfs_ ... guide.html , to help newcomers with applying GNFS and SNFS tools.
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Postby Jwb52z » Thu May 14, 2009 1:38 am

Monday, April 27th, 2009. The total number of the composites was reduced to 2000. That's an ECM attack!
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Postby Jwb52z » Tue May 26, 2009 12:13 pm

Thursday, May 25th, 2009. Sean A. Irvine set up a new GNFS record, http://xyyxf.at.tut.by/records.html#gnfs , of 147 digits, http://xyyxf.at.tut.by/records/c147_118_82.txt . It took 17 days to complete the factorization of 118^82 + 82^118.
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Postby Jwb52z » Wed Jun 24, 2009 4:05 am

Tuesday, June 23rd, 2009. The list of the wanted composites, http://xyyxf.at.tut.by/wanted.html#0 , was significantly expanded due to Greg Childers' SNFS efforts. :-) About 170 new numbers were added, preferably with smaller x's and SNFS difficulty < 200.
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Postby Jwb52z » Fri Jul 31, 2009 9:49 pm

Monday, July 20th, 2009. MSieve 1.42, http://www.boo.net/~jasonp/qs.html , was released, http://www.mersenneforum.org/showpost.php?p=181828 .
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Postby Jwb52z » Tue Aug 25, 2009 11:25 pm

Thursday, August 20th, 2009. The total number of the composites was reduced to 1900.
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Postby Jwb52z » Mon Nov 30, 2009 1:51 am

Thursday, November 19th, 2009. No prime factors of 122^93 + 93^122, http://xyyxf.at.tut.by/records/c241_122_93.txt , were known until Greg Childers factored this really huge number with SNFS, setting up an SNFS record, http://xyyxf.at.tut.by/records.html#snfs , at 241 digits, http://xyyxf.at.tut.by/records/c241_122_93.txt , which is quite hard to beat. This just reminded me a seven years older 188-digit SNFS record, http://xyyxf.at.tut.by/records/c188_98_81.txt , by Paul Leyland. At that time, in 2002, it was unbelievable that a 195-digit SNFS job would not fit the Top-20. But with Greg's new result the last C195 fell out of the table.
Grand respects and congratulations to Greg Childers, http://xyyxf.at.tut.by/contributors/childers.txt , the man with the largest contribution, http://xyyxf.at.tut.by/contributors.html#0 , to our project.
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Postby Jwb52z » Fri Dec 04, 2009 4:19 am

Wednesday, November 25th, 2009. The total number of the composites was reduced to 1800. Quite a speed, http://tech.groups.yahoo.com/group/xyyxf/message/1931 .
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Postby Jwb52z » Mon Dec 14, 2009 9:58 pm

Monday, December 7th, 2009. Two new GNFS records, http://xyyxf.at.tut.by/records.html#gnfs , at 150, http://xyyxf.at.tut.by/records/c150_134_102.txt , and at 151, http://xyyxf.at.tut.by/records/c151_127_80.txt , decimal digits, were established by the powerful RSALS sieving grid, http://boinc.unsads.com/rsals , with a help of Lionel Debroux and Jeff Gilchrist. Both huge tasks took only 8 calendar days to complete. Congratuations to the RSALS team!
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